Search capabilities. The following list is the list of the main search criteria that a discovery service must imple- ment in the discover metadata operation (= to the getRecord operation of the CS-W specifi- cation): - keywords - topic category - resource title, resource abstract, resource type and resource identifier - geographic bounding box - temporal extent - scale or spatial resolution - responsible party - language - creation and publication dates - service type Discovery client approach There are two possibilities for a client to be connected to a group of national catalogues: - The discovery client knows all the catalogues, and is able to send a request to each of them: o Advantages: ▪ Searches can be processed by the client: so the client can decide by its own how the search is operated. ▪ The response time of a single search request may be more predictable as no hidden requests to third party catalogues are involved. o Disadvantages: ▪ Every client has to determine the Discovery Service topology from time to time. ▪ The searches must be processed by every client (it is not transparent to the client). ▪ Discovery Services which are not directly accessible (e.g. running behind a firewall in an intranet) cannot be accessed. - The discovery client is connected to only one “European Catalogue” which is con- nected to all national catalogues o Advantages: ▪ The Discovery Service must only know its direct “child-catalogues”. ▪ Discovery Services behind a firewall can be accessed. ▪ Searches don’t have to be processed by every client. o Disadvantages: ▪ More enhanced query request and response structures are needed. ▪ Every Discovery Service that provides access to federated catalogues must process searches. ▪ The response time for a single request may be less predictable as xxxxx- xxx hidden requests to (potentially slow) third party catalogues are involved and may infringe the QoS requirements. To speed-up very slow respond- ing remote Discovery Services a Discovery Service may harvest their con- tent from time to time (creating an entire local cache of the metadata) and perform searches locally by filtering on all cached results of such a xxxx- xxxxx. More information about the INSPIRE discovery services: xxxx://xxxxxxx.xxx.xx.xxxxxx.xx/documents/Network_Services/TechnicalGuidance_Discovery Services_v3.1.pdf
Search capabilities. The system shall provide users with the ability to search for information (by date, case, by attorney, by hearing location, etc).
